build release binary with gitlab ci

.gitlab-ci.yml

-image: gcc
+image: rust
 
 stages:
-  - build
+  - test
+  - release
 
-job:
-  stage: build
+before_script:
+  - uname -a
+  - DEBIAN_FRONTEND=noninteractive apt-get update -y
+  - DEBIAN_FRONTEND=noninteractive apt-get install -y curl mktemp build-essential
+
+test:
+  stage: test
+  script:
+    - RUST_BACKTRACE=1 cargo test --release
+  except:
+    - tags
+    - release
+  cache:
+    paths:
+      - target
+
+release:
+  stage: release
   script:
-    - uname -a
-    - DEBIAN_FRONTEND=noninteractive apt-get update -y
-    - DEBIAN_FRONTEND=noninteractive apt-get install -y coreutils curl mktemp file tar sed sudo build-essential 
-    - curl -sSf https://static.rust-lang.org/rustup.sh | sh
-    - cargo build --release
\ No newline at end of file
+    - cargo build --release
+    - mv target/release/mqttnc .
+  only:
+    - tags
+    - release
+  cache:
+    paths:
+      - target
+  artifacts:
+    name: "mqttnc-${CI_COMMIT_REF_NAME}"
+    paths:
+      - mqttnc